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Efficient wireless transmission scheme based on the recent DST-MC-CDMA

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Abstract

The capacity of a multicarrier code-division multiple access (MC-CDMA) system is limited by a multiple access interference (MAI) from other users. In this paper, we propose a MAI cancellation scheme to transmit images over a recent discrete sine transform (DST) based MC-CDMA (DST-MC-CDMA) system. In the proposed scheme the minimum mean square error (MMSE) equalizer is used to provide the initial estimate of users’ data and the parallel interference cancellation (PIC) scheme is then used to regenerate and cancel the MAI from the desired user. The proposed scheme is called MMSE-PIC. Simulation results in multi-path fading channel confirm the excellent performance of the proposed scheme as compared to MMSE equalization method. It is also found that the best suitable tentative decision for the proposed scheme is the null zone decision or the clipper decision. We also conduct experiments to show the performance of the proposed scheme with a real image transmission over the DST-MC-CDMA system. Results show that the proposed scheme provides significant image quality improvement as compared to the existing schemes. The average peak signal to noise ratio improvement achieved by the proposed scheme over the conventional MMSE equalizer at a SNR = 30 dB is about 6.5 dB for different number of users.

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Authors and Affiliations

  1. Department of Electrical Engineering, Faculty of Engineering and Architecture, IBB University, Ibb, Yemen

    Abdulmajid F. Al-Junaid & Faisal S. Al-kamali

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  1. Abdulmajid F. Al-Junaid
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  2. Faisal S. Al-kamali
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Correspondence to Faisal S. Al-kamali.

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Al-Junaid, A.F., Al-kamali, F.S. Efficient wireless transmission scheme based on the recent DST-MC-CDMA. Wireless Netw 22, 813–824 (2016). https://doi.org/10.1007/s11276-015-0990-4

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  • DOI: https://doi.org/10.1007/s11276-015-0990-4

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